Blower v-alve bob  book drills



Feb. 3, 1931. E. B. LEAR BLOWER VALVE FOR ROCK .DRILLS Filed lay 5, 1930 Patented Feb. 3, 1931 clear the invention.

'EARL 1a. LEAB, or PHI-IJLIPSBURG,-1NEW UERSEL Assrenoa To K1NGrm'msom.:RANDi COM- VPnlwyojr JERsEYicrTY,'NEW-JERSEY,CORPORATION-orNEWJERSEY 'BLOWER VALVE EGRIRO'GK-DRLLS f Y'applifattnm ieafnayr, 1930.11seria-1. No. '4495797.- j v This 4invention @relates 'to @rock drillsybut Lmore particularly- :to ":blo'wvi-ng i valves for l, :a 'rock'.drill;

Sltisan object-of thisV invention ito enable .the loperator of a roekf drill to f quickly Aand A economically blow fthe dusteand @rock cutting willpermit thel cleansing'of `the 'drill hole by compressed air. These objects are accom` -plished .by fthe mechanism shown :iin the accompanyingdrawing;v

f The `drawing is :a: sectional .elevation ofso much Aoi" a rockdrill-asfwill serve to :make

`Referring fmore .particularly @to 'the drawing, 2l designates thecylinder of azrock .drill Within `which a piston 4l is fadaptedto 'reciprocate Vand to deliver hammer 'blows to r a YWorking implementf; VA .riflebarrS attached tothe pavvl and ratche't'mechanism 10 serves "to cause the rotation-ofthe `drillfsteel '6 through AtheTmediu'rn ofthe' rillefnu-t' l2 'and the chuck Imecha'nisrmlf-l. The frot'ation mech.

anism and the Y generalfo'peration fof the drill has Vnot been completely {eXplar-ne'd :since it Aforms no partof thi'sinventi'on'. l '.lhose'skilled in the art andthose interestedinfblovvervalves Y are familiar' Withfthe v'c )perationo'ii freek' drills.

he compressed a-irrequiredfto'operatethe pistonof the rock drill'is" 'admitted at '-theinlet i6 'which' is centrolledbjf 'a throttle valve 18. A distributing valve Tof-'the oscillating 'typeoperates in a valveeh'amber 22;"111'1 :the present instance as illustrated bythe'tlraivving the right hand end of the operating valve is Vwar-Lily, this causes the headI L8 .to -movefrearraised from the seat and compressed air passes over the right hand end of the valve through the passageways 24, 26 and 28 into the right hand end of the rock drill cylinder. When the Vpiston 4 has nearly completed its movement to the left the right hand end of theV valve 2O is closed due to the flow of air over that end and the left hand end 0f the valve 20 is raised admitting air to the left of the piston 4 for the return stroke. The annular groove 30 assis-ts in exhaustinfrv 'pressure fluid from beth the right hand end of the cylinder and Y to 4the valvestem v A39 a spring 58 is placed in` fthe yhollou7 60 of the.k head 50 -the'backlhead tilltOitbe left handen'dief thecylinderglZ@ p l The righthandendoflthebperating.valve l .the 'left hand end -f'of the cylinder.; the presi VvsureiiuidY having :Once VVVbeen used is dis ACharged tothe atmospherethrough thegeX- haus't Y porti 32.

Frequentlyduring Athe operation of' afrofk f drill thel hole being drilled Ebecomesyelogged with Afine rock dust :and cuttings l from V.the

r'ocki-being drilled. If water isi-being used to cleansethe holeyfthe. dlrist,l and cuttings `form asludge ivvitli thejvvater. yInl either; case itt is qnecessaryrfto vremove the gdust andlchilps'gor the sludge at requentfintervalsiby1a..,strong blast: of compressedyair`- vto the-'bottom of the drillE hole.` Tothis end the blower valve [about to be described .islattache'd to therockgidrill. Underneath the distribution Valvef2f0 in the .boss .36am aperture isdrilledgThis aperturel passes Athrough :the rinlet'ipafssagef 28, the exhaust Vpassage 82 `andthe :inlet gpassafgez29.

'The valveitselffis formed offapiecejiof fbar stock reduced `to a stein `by turning 4the points; 38, 89, lgland .42. VTurning.atf'th'e -points mentioned forms lhcfaclsklll, 50.{onthefvalve stem.i `An aperture v52 is" `formed in .theback head Mof'therockdrill. l. v.The a-ssen'ibly. of :theblowen vvalve is Vais jfollows z Before they baekfh'ead 54C of the rock drill ,is 'put in place,-the-valve stem 89-is 5Placedlin the' aperturer34 andbutton 5 6 itted f54 isthen fput ,in 'plaeeon the rock drill, `the spring -58 being in place `sinfthe aperture 52. y

yAssuming that @the operator. Wishes to'stop drilling operations and to b'loiv thefhole clear `ef accumulated dust and cuttingsthe'operationof the blower valve iisas `follows.: Y The operatorpushes zthe button-56 rearwardly.- closing the inlet passages l26 and128 f At the 'same time Vthe :head v1:6 `closesA the pas- -Qpen and @inflows through kthe passage 20 will yremain@closed due Ytothe fac-tthat a "fpassagfe: is opened-When the-blower-valve forced rearwardly. nThsfrg-permtis fair-to 'fida freelyfawemhefaeat eadmfthe le@ valve 2O for an instant and the valve is thus quickly closed due to the dierential in pressure on top of the valve and underneath the valve. The differential referred to will al- 5 Ways be greater than the differential in pressure above the left hand endof, the valve and under that end of the valve because pressure fluid admitted into the left hand end of the cylinder 2 during the blowing operation o is not exhausted-quite as rapidlyv as it may enter and therefore the pressures above the valve and below the valve are substantially equal.

Compressed air which enters through the 15 passage 29 during the blowing operation first fills the left hand end of the cylinder and then forces air down the Vflutesf in the nose 68 `of the piston i after which it passes .through the hollow drill steel 6 between the no water tube 70 and the walls of the aperture y in thek drill steel.` In this manner'compresse -air is made to enter the Adrill hole at a high velocityjzforcing water, sludge, dust and chips from the hole, thuscffeetively cleans- "as ing it.) When the drilled hole has been satis- ,v factorily cleansed the operator releases the button A56 and the spring 58 forces the blower 'valve back to the'position shown in the figure,

the head Llil'acting as a stop to limit the for- `vsu ward movement of the valve.`

I- claim: "j 1L Ina fluid actuated rock drill of the hamnier type,l the cembinationfof acylinder and a relciprocatory'piston, a valve chest and dis- 35 tribut-ing'valve therein controlling the supply of pressure fluid for the cylinder inlet passages between the valve chest and the cylinder for supplying pressure fluid for actuating the piston, an exhaust port-in the cylin- 4s der ,for exhausting spent pressure fluid'from both ends of the cylinder, means for closing one ofsaid'inlet passages `'and thel exhaust port thus permitting pressure fluid to enter one'end ofthe cylinder and to flow from that i5 yend to the drilled hole, said means compris- Aing a valve stem having a vplurality of heads thereon, said heads adapted to cooperate with a bore in the cylinder wall, said' bore crossing the inlet passages and the exhaust pasv 5a save. v

In a fluid'actuated rock drill of the hammer type, the combination of a cylinder and 'a reciprocatory piston, a back head on said cylinder, a valve chest and'distributing valve stem having a plurality of heads thereon, saidV heads adapted to cooperate with a bore in the cylinder wall, said bore crossing the inlet passages and the exhaust passage, an aperture in the back head and resilient means in said aperture normally holding the blower valve in its inoperative position.

3. In a fluid actuated rock drill of the hammer type, the combination of a cylinder and areciprocatory piston, a valve chest and a `distributing valve therein controlling the supply of pressure fluid for the cylinder, inlet passages between the valve chest and the cylinder, an exhaust port in the cylinder,

means for closing off one of said supply pasmittingan uninterrupted supply of pressure d fluid to flow fromV the other supply passage into the front end of the cylinder and thenc to the hollow drill steel. l 4. In a fluidactuated rock drill of the hammer type, the combination of a cylinder and A a reciprocatory piston, a valve chest anda distributing valve therein controlling the supply of pressure fluidrfor thecylinde'r, inlet passages between the valve chest and the cylinder, an'exhaust rport in the cylinder, means for closingrof'f one of said supply passages from the cylinder and of closing said exhaust port .toithe`atmosphere, said means opening a direct passage between the said supply' passage and the atmosphere and permitting an uninterrupted supply of pressure fluid to flow from the other supply passage into the frontend of the'cyli'nder and thence to the hollow drill-steel, said means comprising a valve in a bore in the cylinder, said valve having a plurality of heads, one of said heads acting asv a stop to limit the forward movement ofthe valve, another of the heads acting as a throttle valve to close one of the supply passages,a head intermediate those '.twoheads for closing the exhaust .passage anda ,fourthrhead adapted to close a! passage-way leading from one of the supply passages to ythe atmosphere when the blower valve is not inoperation.

i 1 In testimony whereof I have signed this specification.

4 EARL B. Laan.

therein controlling the supply of pressure fluid for the cylinder inlet passages between thevalve chest and the cylinder for supplying pressure fluid for actuating the piston, an exhaust port in the cylinder for exhaust- ,6D ing spent pressure fluid from both ends of the cylinder, means Y,for closing one`of said inlet passages andthe exhaust portthus perinittingp'ressure fluid to enter one end ofthe cylinder and'to flow from that end to the f" drilled hole, said means comprisinga valve 

